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Fourier transform infrared studies of model polar stratospheric cloud surfaces - Growth and evaporation of ice and nitric acid/iceFourier-transform infrared surface studies are used to probe the microphysical properties of nitric acid trihydrate (NAT) and ice films representative of type I and II polar stratospheric clouds (PSC). Experiments indicate that, on initial exposure to 1.8 microtorr of HNO3, a layer of ice is quantitatively converted to NAT. However, conversion of ice to NAT does not proceed indefinitely, but rather the system reaches saturation. For longer exposures or higher HNO3 pressures, NAM becomes the dominant nitric acid containing species on the surface. Evaporation studies were performed to test the feasibility of a recent denitrification mechanism. The results indicate that ice coated with 0.20 micron of NAT evaporates at a temperature of about 4 C higher than uncoated ice.
Document ID
19910036142
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tolbert, Margaret A.
(SRI International Corp. Menlo Park, CA, United States)
Middlebrook, Ann M.
(SRI International, Dept. of Chemical Kinetics, Menlo Park CA, United States)
Date Acquired
August 15, 2013
Publication Date
December 20, 1990
Publication Information
Publication: Journal of Geophysical Research
Volume: 95
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
91A20765
Funding Number(s)
CONTRACT_GRANT: NSF ATM-86-00764
CONTRACT_GRANT: NASW-3888
Distribution Limits
Public
Copyright
Other

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